Omega Products PHCN-5700 Installation Manual

User’s Guide

RELAY 1

-500

-750

-1000

-250 +250

0

ORP

+500

+750

+1000

®

RELAY 2

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ENTER

www.omega.com

e-mail: [e-mail]

PHCN-5700

pH/ORP Indicator ORP Instructions

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WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.

OMEGA PHCN-5700 pH/ORP Indicator - ORP Instructions

CAUTION!

• Refer to instruction manual for more details.

• Remove power to unit before wiring input and output connections.

• Follow instructions carefully to avoid personal injury.

ENGLISH

Contents

1. Power Connections

2. Compatible Electrode/Preamp Wiring

3. 4 - 20 mA Current Output Connections

4. Relay Connections

5. Relay Operation

Remove terminal blocks for easy wiring

1.

Std. Sensor

U

L

1 2

1. Power Connections

CAUTION!
Never connect 110 VAC or 220 VAC to rear power
terminals. High voltage AC will damage instrument and
void warranty.

= Double Insulated
= DC or AC power

1 2 3 4 5 6

Freq. IN

LISTED
77CJ

Freq. IN

Sen. Pwr.

Open Collector
Sensor

12-24 V

12-24 V

10 W

+

10 W

+

+

Iso. Gnd

output

-

Gnd

PLS

-

1 2 3 4

2

1

Gnd

+

Total

AUX

reset

output

PHCN-5700
Terminals

-

+

Flow

Patent No. D376,328

External power
supply

12 - 24 VDC

OR

12 - 24 VAC

6. Menu Functions

7. Parts and Accessories

8. Specifications

9. Quick Reference Menu Parameters

10. Troubleshooting

11. Maintenance

2.

1 2

3.

Std. Sensor

U

L

1 2

LISTED
77CJ

1 2 3 4 5 6

Freq. IN

Freq. IN

Sen. Pwr.

Open Collector
Sensor

12-24 V

10 W

+

2. Compatible Electrode/Preamp Wiring

Silver (earth ground)

Brown

Blue

Green

White

Red

Black

+

V -

Black wire

4-20

-

mA

Brown wire

Iso. Gnd

mV Input

Blue wire

T +

Green wire

T -

White wire

V +

Red Wire

1 2 3 4

+

Gnd

+

Gnd

AUX

PLS

Iso. Gnd

output

output

-

pH/ORP

PHCN-5700
Terminals

2

1

Total

Flow

reset

Patent No. D376,328

Preamp:
OMEGA PH-2720-PA

ORP Electrodes:
OMEGA ORE-2715

OMEGA ORE-2717

Technical Notes:

• To reduce the possibility of noise interference, isolate AC power
lines from signal lines.

• Maximum 4-20 mA loop impedance (sec. 3) is affected by the
supply voltage.

3. 4 - 20 mA Current Output Connections

To isolate output and prevent ground loop problems:

1. Use monitor device with isolated inputs, or

2. Use separate DC supply for PHCN-5700 and monitor device, or

3. Power PHCN-5700 with12 - 24 VAC step down transformer

Technical Notes:

**1/8A fuse recommended (customer supplied)
* 4-20 mA output is internally powered (non-isolated), maximum loop

impedance 350 Ω with a 12 V instrument supply voltage, 950 Ω
with a 24 V instrument supply voltage.

Technical Notes:

• Use six conductor shielded cable for cable extensions up to 120 m
(400 ft) max.

• Cable shield must be maintained through cable splice

Fuse**

1/8A

+

4 - 20 mA

*

-

+

-

4-20

mA

pH/ORP

PHCN-5700
Terminals

4. Relay Connections

Two internal relay contact sets (COM, NO, and NC) may be used for
external device control. Front panel LED annunciators indicate the
activation status of each relay. Each relay can control up to two
devices simultaneously, as shown. Relay operation modes include Low
alarm, High alarm, and Proportional Pulse (sec. 5).

Common device connections include:

• Pulse mode - metering pump control

• Pulse mode - solenoid valve control

• Low or High mode - warning lamps

• Low or High mode - bells or sirens

• Low or High mode - external heavy-duty relay

PHCN-5700

Terminals

NO

C

NC

+

External AC/DC

Relay 1Relay 2

NO

power

Relay

De-energized

C

NO

NC

C

NC

Device

+

A

-

Relay

Energized

C

NO

NC

-

-

Device

B

+

Wiring Example Right
Device A IS powered when relay 2 is de-energized (front panel LED

“off”). Power is discontinued when the relay 2 setpoint is reached
(front panel LED “on”). Device B IS NOT powered when the relay 2 is
de-energized. Power is applied after the relay 2 setpoint is reached.

Technical Notes:

• Maximum relay contact ratings: 5 A @ 30 VDC, 5 A @ 125 VAC,
or 3 A @ 250 VAC

• An external heavy-duty relay must be used for devices with surge
currents or operating currents that exceed the above specifications.

5. Relay Operation

A. LOW alarm mode

The relay is energized when the ORP drops below the setpoint, and is
de-energized when the ORP rises above the setpoint plus hysteresis
(sec. 6.3D, 6.3E).

ORP

Low setpoint=

Adjustable hysteresis=

Relay energized=

Relay de-energized=

C. Proportional PULSE mode

The proportional pulse relay configuration is primarily designed for metering pump control. The operator is prompted to enter a minimum and
maximum ORP setpoint and maximum pulse rate for the assigned relay (sec. 6.3F, 6.3G). Relay pulse width is fixed at 130 ms. Refer to the
operation examples below.

• Metering pump chemical addition (dry contact activation type required)

B. HIGH alarm mode

The relay is energized when the ORP rises above the setpoint and is
de-engergized when the ORP falls below the setpoint plus
hysteresis (sec. 6.3D, 6.3E).

High setpoint=

Adjustable hysteresis=

Relay energized=

Relay de-energized=

ORP

300 pulses

Example 1 (right):

As the process ORP rises above the minimum pulse setpoint (-500 mV) the relay
begins pulsing; triggering the metering pump for chemical addition. As the ORP
continues to rise, pulsing accelerates proportionally until the maximum programmed
pulse rate of 300 pulses/minute and setpoint (+500 mV) are reached, forcing the
process ORP back down to intended levels (e.g. ≤ -500 mV).

Example 2 (right):

As the process ORP falls below the minimum pulse setpoint (+500 mV) the relay
begins pulsing; triggering the metering pump for chemical addition. As the ORP
continues to decrease, pulsing accelerates proportionally until the maximum
programmed pulse rate of 300 pulses/minute and setpoint (-500 mV) are
reached, forcing the process ORP back up to intended levels (e.g. ≥ +500 mV).

ORP

-1000
mV

-1000
mV

0 pulses

30

-500 mV

300 pulses

-500 mV

Relay 1 or
Relay 2

30

Relay 1 or
Relay 2

+500 mV

+500 mV

+1000

0 pulses

ORP

+1000

mV

mV

6. Menu Functions

ENTER

To access either CALIBRATE or OPTIONS menus, press and hold the
ENTER key as illustrated below:

Press &
hold for

ENTER

access:

VIEW

2s 5s

CALIBRATE

OPTIONS

Menus:

• VIEW menu (sec. 6.1): The VIEW menu is displayed during

standard operation. The operator can navigate freely through the
menu by pressing either UP or DOWN arrow keys.

• CALIBRATE Menu (sec. 6.3): The CALIBRATE menu contains all

critical display setup and output parameters. A simple security code
feature prevents unauthorized tampering. The operator is required
to enter a simple access code for menu access. The same code
also unlocks OPTIONS menus.

• OPTIONS Menu (sec. 6.4): The OPTIONS menu contains setup and

display features that are seldom accessed for minor display or
output adjustments.

0 - 14 pH

A

L
A
R

M

1

pH

A

L
A
R

M

2

• Reversible Dial

Your 5700 includes a
reversible dial face for
pH use. See enclosed
pH manual for operation
details.

BA

0

D

14

C

A
L

A
R

M

1

ORP

A
L

A
R

M

2

-

1000

+1000

6.1 VIEW Menu

1

Choose:

↓G

A.

ORP mV/Raw mV

B.

Loop output

C.

Range

D.

Relay 1

E.

Relay 2

2

Change:

3

Save:

Menu Displays A - G:

(Factory default displays shown in menu
column 1)

A. Shows calibrated solution ORP mV

and Raw (uncalibrated) input mV
from ORP electrode/preamplifier

B. Loop output display: shows the loop

current output level.

C. ORP range display: shows the

programmed min and max meter
range (sec. 6.3A)

D. Relay 1 display: this display shows

the programmed operation mode
and setpoint for relay 1 (sec.

6.3D-E)

E. Relay 2 display: this display shows

the programmed operation mode
and setpoint for relay 2 (sec.

6.3D-E)

F.

G.

Last calibration

Buffer calibration

↑A

Press and release to access

EASY CAL Procedure

See EASY CAL Procedure (Section 6.2)

F. Last calibration: this display shows a

user defined setup date for
maintenance records. This feature is
not an internal timer or calender.

G. EASY CAL: press the right arrow key

to access the EASY CAL buffer
calibration procedure (sec. 6.2).